the pentagon is investigating general john allen, the top u.s. commander in afghanistan, in connection with the scandal that took down cia director david petraeus. >> general allen is entitled to due process in this matter. >> reporter: the fbi gave the pentagon more than 20,000 pages of e-mail communications between general allen and tampa socialite jill kelley. kelley went to the fbi with anonymous threatening e-mails. agents traced those to paula broadwell, and uncovered her affair with petraeus. one defense official describes the e-mails between general allen and kelley as flirtatious. another official tells cbs news some of the e-mails were more than friendly ex changes and may have crossed the line. general allen said he did nothing wrong, but for now the capitol hill hearings on his promotion are delayed. >> at the request of the secretary of defense the president has put on hold general allen's nomination. >> reporter: in addition to social using with kelley, both general allen and petraeus wrote letters of support foreher sister in a cus